#!/bin/sh
#
# 2011-2013 Nico Schottelius (nico-cdist at schottelius.org)
# 2016-2019 Darko Poljak (darko.poljak at gmail.com)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#
#
# This file contains the heavy lifting found usually in the Makefile.
#

# vars for make
helper=$0

basedir=${0%/*}/../
# run_as is used to check how the script is called (by $0 value)
# currently supported sufixes for $0 are:
# .darko - run as darko
basename=${0##*/}
run_as=${basename#*.}

to_a=cdist-configuration-management
to_d=googlegroups.com
case "$run_as" in
    darko)
        from_a=darko.poljak
        from_d=gmail.com
        ml_name="Darko Poljak"
        ml_sig_name="Darko"
    ;;
    *)
        from_a=nico.schottelius
        from_d=ungleich.ch
        ml_name="Nico Schottelius"
        ml_sig_name="Nico"
    ;;
esac

# Change to checkout directory
cd "$basedir"

version=$(git describe)

option=$1; shift

case "$option" in
    print-make-vars)
        printf "helper: ${helper}\n"
    ;;
    print-runas)
        printf "run_as: $run_as\n"
    ;;
    changelog-changes)
        if [ "$#" -eq 1 ]; then
            start=$1
        else
            start="[[:digit:]]"
        fi

        end="[[:digit:]]"

        awk -F: "BEGIN { start=0 }
            {
                if(start == 0) {
                    if (\$0 ~ /^$start/) {
                        start = 1
                    }
                } else {
                    if (\$0 ~ /^$end/) {
                        exit
                    } else {
                        print \$0 
                    }
                }
            }" "$basedir/docs/changelog"
    ;;

    changelog-version)
        # get version from changelog
        grep '^[[:digit:]]' "$basedir/docs/changelog" | head -n1 | sed 's/:.*//'
    ;;

    check-date)
        # verify date in changelog is today
        date_today="$(date +%Y-%m-%d)"
        date_changelog=$(grep '^[[:digit:]]' "$basedir/docs/changelog" | head -n1 | sed 's/.*: //')

        if [ "$date_today" != "$date_changelog" ]; then
            echo "Date in changelog is not today"
            echo "Changelog: $date_changelog"
            exit 1
        fi
    ;;

    check-unittest)
        "$0" test
    ;;

    ml-release)
        if [ $# -ne 1 ]; then
            echo "$0 ml-release version" >&2
            exit 1
        fi

        version=$1; shift

        to=${to_a}@${to_d}
        from=${from_a}@${from_d}

        ( 
        cat << eof
From: ${ml_name} <$from>
To: cdist mailing list <$to>
Subject: cdist $version has been released

Hello .*,

cdist $version has been released with the following changes:

eof

        "$0" changelog-changes "$version"
        cat << eof

Cheers,
${ml_sig_name}

-- 
Automatisation at its best level. With cdist.
eof
        ) > mailinglist.tmp

        if [ "$run_as" = "build-helper" ]
        then
            /usr/sbin/sendmail -f "$from" "$to" < mailinglist.tmp && rm -f mailinglist.tmp
        fi
    ;;

    release-git-tag)
        target_version=$($0 changelog-version)
        if git rev-parse --verify refs/tags/$target_version 2>/dev/null; then
            echo "Tag for $target_version exists, aborting"
            exit 1
        fi
        printf "Enter tag description for ${target_version}: "
        read tagmessage

        # setup for signed tags:
        # gpg --fulL-gen-key
        # gpg --list-secret-keys --keyid-format LONG
        # git config --local user.signingkey <id>
        # for exporting pub key:
        #     gpg --armor --export <id> > pubkey.asc
        #     gpg --output pubkey.gpg --export <id>
        # show tag with signature
        # git show <tag>
        # verify tag signature
        # git tag -v <tag>
        #
        # gpg verify signature
        # gpg --verify <asc-file> <file>
        # gpg --no-default-keyring --keyring <pubkey.gpg> --verify <asc-file> <file>
        # Ensure gpg-agent is running.
        export GPG_TTY=$(tty)
        gpg-agent

        git tag -s "$target_version" -m "$tagmessage"
        git push --tags
    ;;

    sign-git-release)
        if [ $# -lt 2 ]
        then
            printf "usage: $0 sign-git-release TAG TOKEN [ARCHIVE]\n"
            printf "    if ARCHIVE is not specified then it is created\n"
            exit 1
        fi
        tag="$1"
        if ! git rev-parse -q --verify "${tag}" >/dev/null 2>&1
        then
            printf "Tag \"${tag}\" not found.\n"
            exit 1
        fi
        token="$2"
        if [ $# -gt 2 ]
        then
            archivename="$3"
        else
            archivename="cdist-${tag}.tar"
            git archive --prefix="cdist-${tag}/" -o "${archivename}" "${tag}" \
                || exit 1
            # make sure target version is generated
            "$0" target-version
            tar -x -f "${archivename}" || exit 1
            cp cdist/version.py "cdist-${tag}/cdist/version.py" || exit 1
            tar -c -f "${archivename}" "cdist-${tag}/" || exit 1
            rm -r -f "cdist-${tag}/"
            gzip "${archivename}" || exit 1
            archivename="${archivename}.gz"
        fi
        gpg --armor --detach-sign "${archivename}" || exit 1

        project="ungleich-public%2Fcdist"
        sed_cmd='s/^.*"markdown":"\([^"]*\)".*$/\1/'

        # upload archive
        response_archive=$(curl -f -X POST \
             --http1.1 \
             -H "PRIVATE-TOKEN: ${token}" \
             -F "file=@${archivename}" \
             "https://code.ungleich.ch/api/v4/projects/${project}/uploads" \
             | sed "${sed_cmd}") || exit 1

        # upload archive signature
        response_archive_sig=$(curl -f -X POST \
             --http1.1 \
             -H "PRIVATE-TOKEN: ${token}" \
             -F "file=@${archivename}.asc" \
            "https://code.ungleich.ch/api/v4/projects/${project}/uploads" \
             | sed "${sed_cmd}") || exit 1

        # make release
        changelog=$("$0" changelog-changes "$1" | sed 's/^[[:space:]]*//')
        release_notes=$(
            printf "Release %s\n\n%s\n\n%s\n\n**Changelog**\n\n%s\n" \
                "${tag}" "${response_archive}" "${response_archive_sig}" "${changelog}"
        )
        curl -f -X POST \
             -H "PRIVATE-TOKEN: ${token}" \
             -F "description=${release_notes}" \
            "https://code.ungleich.ch/api/v4/projects/${project}/repository/tags/${tag}/release" \
            || exit 1

        # remove generated files (archive and asc)
        if [ $# -eq 2 ]
        then
            rm -f "${archivename}"
        fi
        rm -f "${archivename}.asc"
    ;;

    release)
        set -e
        target_version=$($0 changelog-version)
        target_branch=$($0 version-branch)

        echo "Beginning release process for $target_version"

        # First check everything is sane
        "$0" check-date
        "$0" check-unittest
        "$0" check-pycodestyle
        "$0" shellcheck

        # Generate version file to be included in packaging
        "$0" target-version

        # Ensure the git status is clean, else abort
        if ! git diff-index --name-only --exit-code HEAD ; then
            echo "Unclean tree, see files above, aborting"
            exit 1
        fi

        # Ensure we are on the master branch
        masterbranch=yes
        if [ "$(git rev-parse --abbrev-ref HEAD)" != "master" ]; then
            echo "Releases are happening from the master branch, aborting"

            echo "Enter the magic word to release anyway"
            read magicword

            if [ "$magicword" = "iknowwhatido" ]; then
                masterbranch=no
            else
                exit 1
            fi
        fi

        if [ "$masterbranch" = yes ]; then
            # Ensure version branch exists
            if ! git rev-parse --verify refs/heads/$target_branch 2>/dev/null; then
                git branch "$target_branch"
            fi

            # Merge master branch into version branch
            git checkout "$target_branch"
            git merge master
        fi

        # Verify that after the merge everything works
        "$0" check-date
        "$0" check-unittest

        # Generate documentation (man and html)
        # First, clean old generated docs
        make helper=${helper} docs-clean
        make helper=${helper} docs

        ############################################################# 
        # Everything green, let's do the release

        # Tag the current commit
        "$0" release-git-tag

        # Also merge back the version branch
        if [ "$masterbranch" = yes ]; then
            git checkout master
            git merge "$target_branch"
        fi

        # Publish git changes
        if [ "$run_as" = "build-helper" ]
        then
            make helper=${helper} pub
        else
            # if we are not Nico :) then just push, no mirror
            git push
            # push also new branch and set up tracking
            git push -u origin "${target_branch}"
        fi

        # Ensure that pypi release has the right version
        "$0" version

        # Create and publish package for pypi
        make helper=${helper} pypi-release

        if [ "$run_as" = "build-helper" ]
        then
            # Archlinux release is based on pypi
            make helper=${helper} archlinux-release
        fi

        # sign git tag
        printf "Enter upstream repository authentication token: "
        read token
        "$0" sign-git-release "${target_version}" "${token}"

        # Announce change on ML
        make helper=${helper} ml-release

        cat << eof
Manual steps post release:
    - cdist-web
    - twitter
eof
    ;;

    test)
        export PYTHONPATH="$(pwd -P)"

        if [ $# -lt 1 ]; then
            python3 -m cdist.test
        else
            python3 -m unittest "$@"
        fi
    ;;

    test-remote)
        export PYTHONPATH="$(pwd -P)"
        python3 -m cdist.test.exec.remote
    ;;

    pycodestyle|pep8)
        pycodestyle "${basedir}" "${basedir}/scripts/cdist" | less
    ;;

    check-pycodestyle)
        "$0" pycodestyle
        printf "\\nPlease review pycodestyle report.\\n"
        while true
        do
            echo "Continue (yes/no)?"
            any=
            read any
            case "$any" in
                yes)
                    break
                ;;
                no)
                    exit 1
                ;;
                *)
                    echo "Please answer with 'yes' or 'no' explicitly."
                ;;
        esac
        done
    ;;

    shellcheck)
        make helper=${helper} shellcheck
        printf "\\nPlease review shellcheck report.\\n"
        while true
        do
            echo "Continue (yes/no)?"
            any=
            read any
            case "$any" in
                yes)
                    break
                ;;
                no)
                    exit 1
                ;;
                *)
                    echo "Please answer with 'yes' or 'no' explicitly."
                ;;
        esac
        done
    ;;

    version-branch)
        "$0" changelog-version | cut -d. -f '1,2'
    ;;

    version)
        echo "VERSION = \"$(git describe)\"" > cdist/version.py
    ;;

    target-version)
        target_version=$($0 changelog-version)
        echo "VERSION = \"${target_version}\"" > cdist/version.py
    ;;

    *)
        echo "Unknown helper target $@ - aborting"
        exit 1
    ;;

esac